Thermodynamics HW Solutions 797

Thermodynamics HW Solutions 797 - Chapter 10 Boiling and...

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Chapter 10 Boiling and Condensation 10-16 Water is boiled at sea level (1 atm pressure) and thus at a saturation (or boiling) temperature of T sat = 100 ° C in a mechanically polished AISI 304 stainless steel pan placed on top of a 3-kW electric burner. Only 60% of the heat (1.8 kW) generated is transferred to the water. The inner surface temperature of the pan and the temperature difference across the bottom of the pan are to be determined. Assumptions 1 Steady operating conditions exist. 2 Heat losses from the boiler are negligible. 3 The boiling regime is nucleate boiling (this assumption will be checked later). 4 Heat transfer through the bottom of the pan is one-dimensional. Properties The properties of water at the saturation temperature of 100 ° C are (Tables 10-1 and A-9) Electric burner, 3 kW P = 1 atm 100 ° C Water ρ σ l v l = = = = 957 9 060 0 0589 175 . . . . kg / m kg / m N/m Pr 3 3 h fg l pl =⋅ ° 2257 10 0 282 10 4217 3 3 J/kg kg m / s C J / k g C μ .
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This note was uploaded on 01/24/2012 for the course PHY 4803 taught by Professor Dr.danielarenas during the Fall '10 term at UNF.

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